pforams@mikrotax - Trilobatus primordius

Citation: Trilobatus primordius (Blow&Banner, 1962)

Basionym: Globigerinoides quadrilobatus primordius Blow and Banner, 1962

Synonyms:

Globigerinoides quadrilobatus primordius Blow and Banner, 1962:15, pl. ix, figs. Dd-Ff [lower Miocene Globorotalia kugleri Zone, Cipero Fm., Trinidad].—Kennett and Srinivasan, 1983:54, pl. 11, figs. 1-3 [uppermost Oligocene Subzone N4a, DSDP Site 289, western equatorial Pacific Ocean].—Bolli and Saunders, 1985, fig. 20(16) [holotype re-illustrated].—Spezzaferri and Premoli Silva, 1991, pl. VIII, figs. 3a, 4a-d [upper Oligocene base of Zone O6, DSDP Hole 538A, Gulf of Mexico].—Spezzaferri, 1994:35, pl. 11, figs. 1a-d; pl. 12, figs. 2a-b [upper Oligocene base of Zone P22, DSDP Site 116, North Atlantic Ocean].—Stewart and others, 2012, pl. 2, figs. 1a-c [lower Miocene Zone M1, ODP Hole 925A, equatorial Atlantic Ocean].

Taxonomic discussion:

The wall texture of T. primordius may appear bulloides-type in places of the same specimen, but in some case could be an artifact due to differential preservation. Blow and Banner (1962) identified Globigerina praebulloides occlusa, which is presently placed in Globoturborotalita (Chapter 8, this volume) as the ancestor of “G.” primordius. They identified this form as the precursor of the whole “G.” quadrilobatus stock and therefore considered “G.” primordius as a “G.” quadrilobatus subspecies possessing only one supplementary aperture on the spiral side compared to the two often displayed by “G.” quadrilobatus. Trilobatus primordius is here ranked as a species. [Spezzaferri et al. 2018]

Distinguishing features:
Parent taxon (Trilobatus): Supplementary apertures and cancellate wall.
This taxon: Last chamber forms half of the test; low trochospiral, lobulate; 3½ globular, slightly embracing chambers in the last whorl, increasing rapidly in size; sutures depressed; Primary aperture umbilical arch with a thin rim; one small arched supplementary sutural aperture.

Description

Trilobatus primordius differs from T. quadrilobatus by the primary aperture slightly tending toward the peripheral margin and by its more markedly subovate outline and the larger last chamber, and from G. altiaperturus by its sacculifer-type wall texture and the lower arched primary and supplementary apertures. [Spezzaferri et al. 2018]

Low trochospiral, subovate and lobulate in outline, chambers globular arranged in 2½-3 whorls, in spiral view 3½ globular, slightly embracing chambers in the last whorl, increasing rapidly in size. The last chamber is half of the entire test. The sutures are depressed, straight to slightly curved on both sides; umbilicus small, but open and deep, enclosed by surrounding chambers. Primary aperture umbilical, a low to moderately high arch, slightly extending from the umbilicus towards the periphery, bordered by a thin rim; one supplementary sutural small and low arched aperture on the spiral side. [Spezzaferri et al. 2018]

Normal perforate, spinose, ruber/sacculifer-type wall.

Maximum diameter of holotype 0.28 mm. [Spezzaferri et al. 2018]

Biogeography and Palaeobiology

Cosmopolitan, sometimes dominant at low-middle latitudes (Spezzaferri, 1994). [Spezzaferri et al. 2018]

The isotopic ratio of this species indicates a mixed-layer habitat and a symbiotic life habit (Poore and Matthews, 1984; Pearson and others, 1997; Pearson and Wade, 2009). These oxygen isotope values indicative of a mixed-layer habitat are very close to those measured in specimens identified as Globigerina cf. bulloides (here named Globoturborotalita pseudopraebulloides n. sp. (Chapter 8, this volume) from the Cipero Formation of Trinidad (Pearson and Wade, 2009). [Spezzaferri et al. 2018]

We suggest Globoturborotalita paracancellata Olsson and Hemleben n. sp. (Chapter 8, this volume) as the ancestral form of T. primordius. [Spezzaferri et al. 2018]

Biostratigraphic distribution

Geological Range:
Notes: Upper Oligocene Zone O6 to Zone M3, where it is rare. Shafik and Chaproniere (1978) reported the co-occurrence of “Globigerinoides” and Paragloborotalia opima, but that observation is not presently proven. Lamb and Stainforth (1976), Stainforth and others (1975), Berggren and others (1985), Iaccarino (1985), Premoli Silva and Spezzaferri (1990), Spezzaferri and Premoli Silva (1991), and Spezzaferri (1994), all reported the first occurrence of the first member of the genus “Globigerinoides” (“G.” primordius) in upper Oligocene Zone O7. Leckie and others (1993) provided constraints on its first occurrence at 25.6 Ma within Zone O7, on the Ontong Java Plateau (Hole 803D), and Bahamas Bank (Hole 628A). Berggren and others (1995) and Wade and others (2011) place the base of this species in Zone O6 at 26.7 Ma and its Lowest Common Occurrence at 24.3 Ma. We find this species present, although rare until Zone M3 (Spezzaferri, 1994; Spezzaferri and others, 2015). [Spezzaferri et al. 2018]
Last occurrence (top): within M3 zone (17.54-19.30Ma, top in Burdigalian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within O6 zone (25.21-26.93Ma, base in Chattian stage). Data source: Spezzaferri et al. 2018

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.9 p.292

References:

Berggren, W. A., Kent, D. V., Flynn, J. J. & Van Couvering, J. A. (1985). Berggren, W. A., Kent, D. V., Flynn, J. J. & Van Couvering, J. A. (1985). Cenozoic geochronology. Geological Society of America, Bulletin. 96: 1407-1418. Geological Society of America, Bulletin. 96: 1407-1418. gs

Berggren, W. A., Kent, D. V., Swisher, I. , C. C. & Aubry, M. -P. (1995b). Berggren, W. A., Kent, D. V., Swisher, I. , C. C. & Aubry, M. -P. (1995). A revised Cenozoic geochronology and chronostratigraphy. In, Berggren, W. A. , Kent, D. V. , Aubry, M. -P. & Hardenbol, J. (eds) Geochronology, Time Scales and Global Stratigraphic Correlations. SEPM (Society for Sedimentary Geology) Special Publication No. 54, 129-212. In, Berggren, W. A., Kent, D. V., Aubry, M. -P. & Hardenbol, J. (eds) Geochronology, Time Scales and Global Stratigraphic Correlations. SEPM (Society for Sedimentary Geology) Special Publication No. 54, 129-212. gs

Blow, W. H. & Banner, F. T. (1962). Blow, W. H. & Banner, F. T. (1962). The mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae. In, Eames, F. E. , Banner, F. T. , Blow, W. H. & Clarke, W. J. (eds) Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge 61-151. In, Eames, F. E., Banner, F. T., Blow, W. H. & Clarke, W. J. (eds) Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge 61-151. gs

Bolli, H. M. & Saunders, J. B. (1985). Bolli, H. M. & Saunders, J. B. (1985). Oligocene to Holocene low latitude planktic foraminifera. In, Bolli, H. M. , Saunders, J. B. & Perch-Neilsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge, UK 155-262. In, Bolli, H. M., Saunders, J. B. & Perch-Neilsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge, UK 155-262. gs

Iaccarino, S. (1985). Iaccarino, S. (1985). Mediterranean Miocene and Pliocene planktic foraminifea. In, Bolli, H. M. , Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambrige University Press, Cambrige 283-314. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambrige University Press, Cambrige 283-314. gs

Kennett, J. P. & Srinivasan, M. S. (1983). Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs

Lamb, J. L. & Stainforth, R. M. (1976). Lamb, J. L. & Stainforth, R. M. (1976). Unreliability of Globigerinoides datum. Bulletin of the American Association of Petroleum Geologists. 60: 1564-1569. Bulletin of the American Association of Petroleum Geologists. 60: 1564-1569. gs

Leckie, R. M., Farnham, C. & Schmidt, M. G. (1993). Leckie, R. M., Farnham, C. & Schmidt, M. G. (1993). Oligocene planktonic foraminifer biostratigraphy of Hole 803D (Ontong Java Plateau) and Hole 628A (Little Bahama Bank), and comparison with the southern high latitudes. Proceedings of the Ocean Drilling Program, Scientific Results. 130: 113-136. Proceedings of the Ocean Drilling Program, Scientific Results. 130: 113-136. gs

Pearson, P. N. & Wade, B. S. (2009). Pearson, P. N. & Wade, B. S. (2009). Taxonomy and stable isotope paleoecology of well-preserved planktonic foraminifera from the uppermost Oligocene of Trinidad. Journal of Foraminiferal Research. 39: 191-217. Journal of Foraminiferal Research. 39: 191-217. gs

Pearson, P. N., Shackleton, N. J. & Hall, M. A. (1997a). Pearson, P. N., Shackleton, N. J. & Hall, M. A. (1997). Stable isotopic evidence for the sympatric divergence of Globigerinoides trilobus and Orbulina universa (planktonic foraminifera). Journal of the Geological Society of London. 154: 295-302. Journal of the Geological Society of London. 154: 295-302. gs

Poore, R. Z. & Matthews, R. K. (1984). Poore, R. Z. & Matthews, R. K. (1984). Oxygen isotope ranking of late Eocene and Oligocene planktonic foraminifers: implications for Oligocene sea-surface temperatures and global ice-volume. Marine Micropaleontology. 9: 111-134. Marine Micropaleontology. 9: 111-134. gs

Postuma, J. A. (1971). Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. Elsevier for Shell Group, The Hague. 1-406. gs

Premoli Silva, I. & Spezzaferri, S. (1990). Premoli Silva, I. & Spezzaferri, S. (1990). Paleogene planktonic foraminifer biostratigraphy and paleoenvironmental remarks on paleogene sediments from Indian Ocean sites, Leg 115. Proceedings of the Ocean Drilling Program, Scientific Results. 115: 277-314. Proceedings of the Ocean Drilling Program, Scientific Results. 115: 277-314. gs

Shafik, S. & Chaproniere, G. C. H. (1978). Shafik, S. & Chaproniere, G. C. H. (1978). Nannofossil and planktic foraminiferal biostratigraphy around the Oligocene-Miocene boundary in parts of the Indo-Pacific region. BMR Journal of Australian Geology and Geophysics. 3: 135-151. BMR Journal of Australian Geology and Geophysics. 3: 135-151. gs

Spezzaferri, S. & Premoli Silva, I. (1991). Spezzaferri, S. & Premoli Silva, I. (1991). Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico. Palaeogeography Palaeoclimatology Palaeoecology. 83: 217-263. Palaeogeography Palaeoclimatology Palaeoecology. 83: 217-263. gs

Spezzaferri, S. (1994). Spezzaferri, S. (1994). Planktonic foraminiferal biostratigraphy and taxonomy of the Oligocene and lower Miocene in the oceanic record. An overview. Palaeontographia Italica. 81: 1-187. Palaeontographia Italica. 81: 1-187. gs

Spezzaferri, S., et al. (2015). Spezzaferri, S. et al. (2015). Fossil and genetic evidence for the polyphyletic nature of the planktonic foraminifera "Globigerinoides", and description of the new genus Trilobatus. PLoS One. 1-20. PLoS One. 1-20. gs

Spezzaferri, S., Olsson, R. K. & Hemleben, C. (2018c). Spezzaferri, S., Olsson, R. K. & Hemleben, C. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene to Lower Miocene Globigerinoides and Trilobatus. In, Wade, B. S. , Olsson, R. K. , Pearson, P. N. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46(Chap 9): 269-306. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 9): 269-306. gs

Stainforth, R. M., Lamb, J. L., Luterbacher, H., Beard, J. H. & Jeffords, R. M. (1975). Stainforth, R. M., Lamb, J. L., Luterbacher, H., Beard, J. H. & Jeffords, R. M. (1975). Cenozoic planktonic foraminiferal zonation and characteristics of index forms. University of Kansas Paleontological Contributions, Articles. 62: 1-425. University of Kansas Paleontological Contributions, Articles. 62: 1-425. gs O

Stewart, J. A., Wilson, P. A., Edgar, K. M., Anand, P. & R. H. , J. (2012). Stewart, J. A., Wilson, P. A., Edgar, K. M., Anand, P. & R. H. , J. (2012). Geochemical assessment of the palaeoecology, ontogeny, morphotypic variability and palaeoceanographic utility of "Dentoglobigerina" venezuelana. Marine Micropaleontology. 84-85: 74-86. Marine Micropaleontology. 84-85: 74-86. gs

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Globular	coiling axis:	Low-moderate	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Globular	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	Sutural
spiral sutures:	Moderately depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	3.5-3.5	N.B. These characters are used for advanced search. N/A - not applicable

Trilobatus primordius

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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